SPI interrupt problem (repetition)

Posted on January 11, 2017 at 21:22

Hi,

Here is my program

#include <stdio.h>

#include <string.h>

#include 'stm32f10x_gpio.h'

#include 'stm32f10x_rcc.h'

#include 'stm32f10x_usart.h'

#include 'stm32f10x_spi.h'

#define SPI_FLASH           SPI3

#define SPI_CLK             RCC_APB1Periph_SPI3

#define SPI_GPIO                GPIOC

#define SPI_GPIO_CLK        RCC_APB2Periph_GPIOC

#define SPI_PIN_SCK         GPIO_Pin_10

#define SPI_PIN_MISO        GPIO_Pin_11

#define SPI_PIN_MOSI        GPIO_Pin_12

void SPI3_IRQHandler(void)

{    

                USART_SendData(USART1,SPI_I2S_GetITStatus(SPI3, SPI_I2S_IT_TXE)+48)    ;    

                SPI_I2S_ClearFlag(SPI3,SPI_I2S_IT_TXE);            

}

void SPIConfig(void){

SPI_InitTypeDef  SPI_InitStructure;

  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable SPI and GPIO clocks */

  RCC_APB2PeriphClockCmd( SPI_GPIO_CLK , ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3,ENABLE);

  GPIO_PinRemapConfig(GPIO_Remap_SPI3, ENABLE);

  /* Configure SPI pins: SCK, MISO and MOSI */

  GPIO_InitStructure.GPIO_Pin = SPI_PIN_SCK | SPI_PIN_MISO | SPI_PIN_MOSI;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(SPI_GPIO, &GPIO_InitStructure);

    

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

  SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;

 SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;

  SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;

  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;

  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

  SPI_InitStructure.SPI_CRCPolynomial = 7;

  SPI_Init(SPI3, &SPI_InitStructure);

SPI_I2S_ITConfig(SPI3,SPI_I2S_IT_TXE,ENABLE);

SPI_I2S_ITConfig(SPI3,SPI_I2S_IT_RXNE,ENABLE);

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

  NVIC_InitStructure.NVIC_IRQChannel = SPI3_IRQn;

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;

  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init(&NVIC_InitStructure);

  /* Enable the SPI  */

  SPI_Cmd(SPI3, ENABLE);

}

    

void delay(){

    int i,j;

    for(i=0;i<10000;i++)

    for(j=0;j<250;j++);

}

int main(){    

unsgined char p[3]    

SPIConfig();            

    

    while(1){            

    delay();delay();

    USART_SendData(USART1,'A')    ;        

    }

    

    }

    

}

But it prints '1' char continuously and  it doesn't arrive at     USART_SendData(USART1,'A')    ;   line to send 'A' char to terminal while I didn't send & receive anything.what is my mistake?